GENERAL AGRICULTURE

Measurement of irrigation water:

• 1Cusec: 28.3 litres(JRF)

• 1 Cumec: 1000 litres or 10³

• 1 ha mm: 10, 000 litres or 10⁴

• 1 ha cm: 100, 000 lit. or 10⁵(JRF)

• 1 ha m: 100, 000, 00 lit. or 10⁷ (JRF)

Percentage irrigated and water requirement of Major field crops

Crop	% irrigated area	Water requirement (mm)
Sugarcane(JRF)	93%	1500-2500
Wheat (JRF)	85%	650-800
Rice	50%	1500
Oil seed	25%	500-700
Pulses	10%.	450-700

^{PF Value:}

^{·        it is defined by Schoefild (1935).}

 ^{• The logarithm of centimeter height of a water column to give the necessary suction.}

^{• Expressed in centimeter of water (based on the height of a water column above free water level in cm).}

Soil condition	PF values	Pressure (atm/bars)
Saturated soil		0.001
Field capacity(JRF)	2.53	1/3
PWP(JRF)	4.18	15
Hygroscopic point	4.50	31’’
Oven dry soil	7.0	10000